Yep... not a scam... still not happy that not all the space is available... from Sony:
What internal storage (memory) is available on the tablet?
Solution
The Tablet internal storage is partitioned into two different areas: Internal Storage and Internal Storage (USB storage) .
The Internal Storage is where all factory installed applications and multimedia files (pictures, music and video) are stored, while all user installed multimedia files, user customized settings, user downloads, user added applications and application data is stored in the Internal Storage (USB storage) .
Follow this procedure to view the available Internal Storage and Internal Storage (USB storage) memory.
NOTE: Adding together the Total Space listed for the Internal Storage and the Total Space listed for Internal Storage (USB storage) , plus just over 3.1GB of storage reserved for the operating system and other system files, the combined total will equal either 16GB or 32GB, depending on the tablet model you own.